Version: 2018.4
AssetDatabase
Description of the Format

Text-Based Scene Files

As well as the default binary format, Unity also provides a text-based format for scene data. This can be useful when working with version controlA system for managing file changes. You can use Unity in conjunction with most common version control tools, including Perforce, Git, Mercurial and PlasticSCM. More info
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software, since text files generated separately can be merged more easily than binary files. Also, the text data can be generated and parsed by tools, making it possible to create and analyze scenesA Scene contains the environments and menus of your game. Think of each unique Scene file as a unique level. In each Scene, you place your environments, obstacles, and decorations, essentially designing and building your game in pieces. More info
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automatically. The pages in this section provide some reference material for working with the format.

See the Editor window page for how to enable this feature.

AssetDatabase
Description of the Format